Gas burner



z sneatssnear Oct. 9, 1928.

H. D. SCHRADER GAS Burnham` Filed nay 31. 1927 Patented @et 9, 1928.-

xrThis invention relates to improvements gas burners.

a gas burner which will have a great heating capacity and a highefficiency and which will be of simple and substantial construct-ion.v

It is a further'object. of thisinvention to produce a gas burnercombining two separately operating burners one of `which employs aVenturi tube and in which the air is mixed of the tube andthe other ofwhich discharges the gas near the tip of the former burner and vforwhich the air is inspirated by the action of the gas as it leaves theburner.

It is a still further object of lthis invention t'o produce a gas burnerof great'iexibility use in connection with small commercial appliancesand house heating furnaces and boilers.

come apparent as the description proceeds are attained'by means of anlarrangement and -a combination of parts that will now be described indetail and reference for this purpose will now be had to theaccompanying drawings in which the preferred embodiment Y of myinvention has been shown and in which Fig. 1 is a 'vertical diametricalsection through the lower end ofthe furnace, show'- ing my im rovedburner in place therein;

Fig. 2 is a section taken on line 2-2, Fig. 1; Fig- 3 is a detailshowing the construction of the gas adjusting valve member;

Fig. 4 is a vertical longitudinal section through the burner;

Fig. 5 is a section vtaken on line 5v5, Fig. 4;

Fig.,7 is a section taken on line 7-7, Fig. 4,

My improved gas burner has been illustrated in connection with a furnacewhose cylindrical wall has been designated by numeral 1. The lowerportion of this furnace has been shown as lined with alayer of firebrick or clay 2. The bottom of the v{irebox' is formed by aA circularslab 3 of 'fire' cla-y lfrom whose center a square or other shapedcolumn '4 extends upwardly. The slab, 3'is rovided with two parallelpassages 5 and 6 which communicate respectively with the verVtical'openings 7 and 8 of column 4. The upper end of column 4 has aconical recess 9 which supports the inner ends ofthe radial bars 10whose outer ends are supported on the Application 'filed Hay i 31,

Itis the object of this invention to produce` with the ygas at or nearthe intake end e that shall be particularly well adapted for The. aboveand other objects that may. be-

Fig. 6 is a section taken online 6--6, Fig. 40 4; and

sesam A UNITED s'ruriazsv PfATsNr erstes.

HARQLD D. SCHRADEB, OF DENVER, COLORADO.

Gas BURNER- 1927. serial No. 195,285.

upper end of the cylindrical wall 2. 4A c'ollection of" broken tirebrick or otherhighly vrefractory material 11 is supported. on the barslOand'when these are heated to inc'an- 60. descence, they Aresemble a bedof live coals f andserve to store and to radiate. heat. The

furnace walll and lining 2 are provided with registering openings 12 forthe reception of` the burner assembly which will now be described indetail. The burnerconsists of a Venturi tube 13 whose end -is providedwith a transverse wall having a plurality-of openings 14. The outers'urfaceof the flared end of this tube has a 70 cylindrical portion l5which is ada ted toreceive one end of the mixing hea 1 6.- The"transverse'wall of the Venturi tube has a hub 17 that projectsrearwardly and whose -outer surface is threaded for the reception of the'air regulating plate or shutter. 18 which will be moved towardsfor awayfrom the transversewallwhen it is rotated and which can be Aclamped 'inadjusted position by means of a' set screw 19. Hub 17 has a 80cylindrical opening withinwhich is slidably mounted the primaryv burnerregulating valve body 20. This body has a.cylindrioal` axial opening 21which communicates with thetransverse opening that passes through S5 thelateral extensions 22 and 23. A nozzle 24 has a threaded engagementwith' the wall of opening 21. This nozzle has an axial opening 25 thatterminates in the smaller opening 26. A stem 27 has a threaded portion.9'0 2S hich cooperates with a threaded ope ing 29 in the outer end ofthe wall body. A lock nut 30 serves to hold this stem in adjustedposition. Stem 27 has the Asame outside diameter as the o ening 25 and1s pro- 95 vided with a tip 31 which is of the same size as the opening26 and is lutedlike a reamer. The maximum diameter of the tip 31 is lessthan that of the stem 27 and terminates in a shoulder 32. That portionof the stem adjacentr the shoulder 32v is provided with v taperinggrooves v33 which form passages for the gas. When the stem is rotated soas to -move into the nozzle 24, the area through which thev gas may flowis gradually de-- creased until when the grooves 33 are en- 'tirelywithin the nozzle the flow of gas 'will' be' entirely shut oit. If hole-26 hecomes stopped, it canbe opened by turning the stem 27 until thepoint 31 extends entirely 11o throughthe opening 26. The position ofvstem 27 is adjusted tosuit the conditions under .which the burneroperates; The inner en d of the Venturi tube is threaded, as indi- Icated by numeral 34. .A burner head body has Ca central hub portion 35which has a nected with the cylindrical part 39 and its rear endconnected with the front end of the mixing head 16. The burner headbody, nthe pipe 41 andthe mixing head 16 are iirst assembled after whichtheVenturi tube isinserted throughthe open end rof the as sembly `andscrewed into the threaded opening 36. A gasket 42 islocatedonthecylindric'al surface v15`between the end ofthe .mixing `head andtheexternal shoulder Yat the end of surface 15. When the'parts are larchamber is ormedbetween pipe 41 and tube 13. A burner nozzle 43. has oneend Y providedjwith a threaded section that envgages with the threads inopening 37' and has a conical vsurface 44 that is parallel withtheparallel surface forming the end o vpart 40. .By means of a washer'45of sultable thickness the lconical surface on the nozzle andthecooperating surface on part40 be spaced Many distance desired so as toobtain an annular opening 46 for theescepe of gas, which willlowtherefrom in a conical sheet represented by lines 47 and 48 Theassembly that' has just been descrlbed is located within a cylindricalcasing .formed A by a cylindrical member 49 which is smaller in-diameter 'than 'and locatedLconcentrically within asimilar cylinder 50.The twO Cylindrical members 49 *and 50 are held 1n spaced relation attheir'inner ends by a ring 51 and at the other ends by 1 a.l castinghaving a cylin -cal section 52 and" a cylindrical iange 53^and aninclined wall 54, that connects `one ndof iiange- 53 with 4.the center-portion oft the-l;cylindrical sec;-

tion 52. A damper 55 is mounted for rotation on the outerv surface 0fthe inclinedwall 54.and is provided withopemngs that-correspond in"osition and size to simi lar openings in the inclined wall 54. By nothering 55 the eifective areas through air may enter between members49- and50--c'an be adjusted td any' extent desired.-

.Secured to pipe 41 is affhub v57 a -plu'-,` rality .of radiallypro'ecti'g kes or blades 58 tha t resemble fan lades. e' outer ends ofthese bladesengage the inner-surface of f is nom" g' ,am sans ong '-nited at the 'burner 't'.p`43,l forms a register with the latter. By`rotating plate 64 the elective area. of openings 63 can be.

altered as desired.l Located within the front end of the cylindricalmember 49 is a ring 65 of @refractory material. This ring has its Vinnersurface curved in the manner. shown in Fig.4 and/the surface marked X.is parf allelf with lines 47 and 4 8;

Gas under the appropriate pressure isconducted to .the device throughpipel 66, which is connected with the proper gas supply.

Pipe'66 is connected to the mixing head 16 at 467 and is proridedwithyan electr1callyoper ated valve 68,.that can be controlledfrom a;dlstance, and with a; pressure controlled valve `assembled asdescribed, an' elongated annu`V 69 which Vis connected'Y withthe boiler`by means of v'pipes-70.l A lever or arm 7l has one end connected withthe'va-lve mechanism of valve 69 and the other connected with the'pla-te 64 and rotates the plate so as Vto close the openings '63whenever valve 69 closes.

A' ipe 72 has one. end connected .with pipe66.

at 3-and the otherto'member 20. at 23; A

-stop cock 74 controls theflowof gas through this pipe. Another pipeV 75 has oneend con. nectedwith' the mixing head at-76 and the, otherconnected with member 2 0 at2 2.. This pipe provided with a checkvalve'77 t-ht permits to flow-from the interior of mixn head to theregulating valve but pre flowing inl the .opposite` direcvente` tion. i

Letns now'` assembled `inthe manner-'described and lthatasuction'thatcausesair toffl'ew e combustible 'of gas and fair when ig Yc hot iame. APart of the gas for-the primary burner Hows lh'pipe,-72 andvalve 74'and the rem erthrough pipe v7 5. Gas will alsolown ain throughthe ann ar space between the out'2 sideo the This thinsheet of-gasissuefinV the" of a'hollow cone and pass parallel' with, and

close to surface XL The low .of gas from' o' 46 produces a suctionthatcauseslaii member 49 and serves to` center the burner` assembly.Another cylindrical tubular sec-v I I "le thattheparts" have been.'v

- burner" =Th9`f0w 9i? Venturitube and the inside of pipe `41and outthroughthe-narow opening 46.` s ape blades 64 and thence through holes78 in the refractory ring'` 65. The suction produced by the ow of gasalsov causes a stream of air t`o How inwardly through openings 56through oV the butter y valve' 80 into the space between pipe 41 and theinterior of. the cylindrical member 49 where it is mixed with the coldair that enters through openings 63. The air v that flows vthrough thepassageways 7 and 8 in the column 4 gets very hot as this support Y themto mix thoroughly.

a single justing the isks so as to produce almost e is located directlyin the path of the iame and is usuall incandescent. B yproperly ad- 64and 55 any desired proportions of cold and hotair can be obtained. Asthe cold-and the hot air pass the blades. 58, they are given a rotarymotion that causes` When the pressure in the boilerfexceeds apredetermined value, valvel 69 closes Aand when this occurs the openings63 will also be closed by the disk 64 which is operatively Y connectedwith this valve by means of the arm 71. Whenever valve 69` closes thesecondary. `burner will cease to function and at the same time theonlgas thatwill-reach the primary burner will e'that whichows through pipe72 and this can be adjusted so. that the heat produced Vby the primaryburner will be just about suiiicletto jmaintain the temperature of thefurnace or the pressure ofthe boiler constant. When valve 69`opens afterhaving been closed, the primary burner will serve to ignite the gas.- Apilot light (not shown).

isprovided for igniting the -primary burner.

By combining the burners in the manner shown, a eaterflexibilityis'obtained Athan if urneriwere used as with the two burners these canbe `so adjusted that a quick increase inthe heat can be obtained' `whenboth are operating and when the .primary biirner is used alone, this canbe regulated tain the temperature at the desired value l after 'it hasbeen brought there by the combined aetionof both burners.'

vHaving described my invention" what I claim as new is: f

1. A compound gas burner comprisin 'aj 'prima burner formed in artfrom aen turi tu e and a secondary lirner having an annular passa eway formedby the outer surface' of the enturi tube and by the inner surface ofapipe cmcentric therewithl and independently 'controlled means foradnitting air 'and gas to the interior- 'of the tube 'I and to theannular space. Y

. in combination,

2. A compound gas' burner compri-sing,

a Venturi tube having its.

the main portion of the tube, the outer surfaceA of the'aredend having;a cylindrical surfaceprovided' with a shoulder, a ipe enclosing theVenturitube, a' mixing ead sel cured to the pipe,.'said 'head having] a.eylin-A enings 5, 7, 8 and 6, pipe- 79 past nough heat to maindricalportion adapted to lit onto the cylindrical surface, a gasket locatedbetween the shoulder and the end of the mixing head and means forconnecting the other end ofthe Venturi tube to the adjacent end of thepipe and for forcing the end of the mixing head v against the gasket.

3. A`compound gas burnerrcomprising, 1n comblnatlon,

flaring and of a greater diameter than the a Venturitube having its basef `main portion of the tube,.the outer'vsurface of the flared end havinga vcylindrical surface provided with a shoulder, a pipe enclosing theVenturi tube, a mixing head securedto the pipe, said head having acylindrical portion adapted to fit onto' the 'cylindrical surface, agasket located between the shoulder and the end of the mixing head, anda burner head provided with two concentric cylindrical portionsconnected by a Aperforated partition, the

larger cylindrical portion-being connectedwith the pipeandthe other withthe Venturi tube.

' 4. A compound'gas'-bl'1rner comprisinr, in combination, a Venturi tubehavingy its ase flaring andof ai greater diameterthan the main portionof the tube, the outer surface of the-flared end having a cylindricalsurface provided with a shoulder, a pipe enclosing the Venturi tube, amixing headjsecured' to tlie pipe, said headhaving' a cylindricalportion adapted to it onto the cylindrical surface, a gasket locatedbetween the shoulder and the end of the mixing head, a burner headprovided with twoy concentric cylindrical por tions connected by aperforated partition, the

larger cylindrical vportion being connected withrthe pipe and the otherwith the Venturi tube,'means for admitting air and the flared end ofthe` Venturi tube and means for admitting gas into the annular'spacebe-.tween the Venturi tube and the' pipe. e

5. A compound gas burner comprising, in =combination, Vflaring and ofz'amainv portion of t of the flared end having a cylindrical surfacerovided with a shoulder, a pipe enclosing the enturi tube, a mixing headsecured to the pipe,'said headhaving a cylindrical. portion adapted tofit onto the clmdricalsurface, a gasket located betweenv t es houlderand the endof-the mixing head, a.' burner .head,pro'. vided with twoconcentricn cylindrical portionsconnected by al perforated partition,the',

greater diameter than the larg'l r cylindrical rtion being connectedvwat the pipe and t e other -with the Venturi the foradmitting gas intothe annularV space between thefVenturi tube and the" ipe, and a nozzlesecured to' the ,burner hea said -noz'- aVenturi tube having its base etube, the outer surface v zle having'an opening in line with the Venfturi tllzi, a .portion of the outer .smface of the no being eomcal and`adapted toform I .withl the r heada'circular passage for D ageway. l

- main portion of the tube, the outer surface of th ared end having acylindricalsurface pr videdV with a shoulder, a 'pipe enclosing theVenturi tube, a mixing head securedto the pipe, said head hav-ing acylindrical p ortionadpated to fit onto the-cylindrical surface, agasket locatedbetween theshoulden. Aand. the end fof themixing head, aburner"I headprovided with'two concentric cylindrical portions connectedby a perforatedparv, tition,'the larger cylindrical portion beirigconnected with the pipe and the other with the Venturi`tube, means foradmitting air l and 'gas into the flared end ofthe. Venturi tube andmeans' :for admitting gas into the annula space between the'LVent-uritubeand l the pipe', a nozzlejsecured to the burner head,

' said nozzle '-,having'an opening in linewith the Venturi .tubeaportionv of the outersurface ofthe-nozzlebeing conicaland adapted toform with the burner head a circular pas'- passageway, a cylindrical'closure enclosing the-plpe, means for spacing the pipe and burner .fromthe closure, means Slidably oonnected with the. pipe and adapted toengage the end of the'cylindricalgclosure and means comprising. a springfor holding the slidable v means against the end of the-cylindrical'clo- V 74A Inground gs'blll'eer Compl-lans primary b rner composed of'a Venturi tube, a detachable nozzle' at one end and means at the-otherfendfor admitting air andj gas, a .secondaryburner comprising a -pipe'enclosinggthe Venturi tube and spaced from. the lat- 'the partition intoclose Ipr outer surface of the nozz e whereby a pasthe tube at onel i ,amixing head connecting the pipe and f2 *r f4 rncaa'a'ir-f I,

'when 'the other and, man@r for admitting lgas into the annular space,said burner head aving al transverse perforated partition and a circularfiange extending forwardly from oximity to the sageway is provided forthe escape of gas, a cylindrical housing enclosing said pipe, means forspacing the pipe from the. housing and-means for admitting air` into thespace between the pipe and the housing.

V l8.l A compound gas burner comprising a primary burner composed of aVenturitube,

a detachable nozzle at one endl and means. at

the'other end 'for admitting' air and gas, a

secondary burner comprising a pipe` enclosing 'the Venturi tubeandspaced fromthe latter so as to ,form an annular passage, a burner headsecuredtofthepipe and theltube at one -end, .a mixing lhead connectingthe pipe and tube at the other end, means for admitting gas into theannular space, said burner head having a tran erse peroratedpartitionand a circular a ge extending forwardly fromthe partition into closeproximity to the outersurface-of the nozzle whereby a pas- A sagewayrisprovided' for the escape of gas, a

. .sagefor the escape of gas from the annular cylindrical housin Ienclosing. said pipe,

tween the pipe and thehousing, a cylindrical member surrounding the-cindrical housing' and spaced from the latte means for'con ne'ctingtheends oi the cylindrical `member with the cylindrical housing, means foradt mitting air into'the space between the cylindrical member and thehousing. and a con# duit extendingvfrom the last mentioned space to thespace between the pipe'and the cylin- -drical housing, a portion of saidconduit being located in the path' of the 'flame 4from the burners. i

"In testimonywhereofil aixmy signature. I

" HAROLD n SCHRADER.

